package com.neuedu.hcp.config.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author ZZD
 * @date 2021/4/27 11:54
 */
public class JwtAuthencationTokenFilter extends OncePerRequestFilter {

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        String authHeader = httpServletRequest.getHeader(tokenHeader);
        //token存在
        if(null != authHeader && authHeader.startsWith(tokenHead)){
             String authToken = authHeader.substring(tokenHead.length());
             String username = jwtTokenUtil.getUserNameFromToken(authToken);
             //token存在用户名但未登陆
             if(null!=username && null== SecurityContextHolder.getContext().getAuthentication()){
                 //登录
                 UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                 //验证token是否有效，重新设置用户对象
                 if(jwtTokenUtil.validateToken(authToken,userDetails)){
                     UsernamePasswordAuthenticationToken authenticationToken =
                             new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                     authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
                     SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                 }
             }
        }
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}
